OMM-DIO-XT

PC/104 48-ch. Digital I/O

Description
Specifications
Ordering Guide

This module is identical to our OMM-XT but it is without the counter/timer and interrupt circuitry. This board still has the quality and attention to detail of our other modules, such as: 10K Ohm pull-up resistors on all I/O lines; all ports reset to 0 on power-up or system reset; connector pinouts compatible with our other digital I/O boards; and free software.

The 48 digital I/O lines on OMM-DIO-XT are based on 2 82C55 ICs. They can be programmed for input or output in groups of 8 lines. Direct as well as strobed (latched) I/O modes are supported, and all I/O lines are connected to 10K Ohm pull-up resistors.

Chip	82C55A (qty. 2)
Number of I/O Lines	48, TTL/CMOS Compatible
Direction	Programmable in groups of 4 and 8
Input Voltage	Low: -0.5V min, 0.8V max High: 2.0V min, 5.5V max
Output Voltage	Low: 0.0V min, 0.4V max 3.0V min, Vcc -0.4V max
Output Current	±2.5mA max, each line
Pullup Resistors	10KOhms all input lines
Power Supply	+5V ±5% @ 120mA typical all outputs open
Operating Temperature	-40 to +85°C

Model	Description
OMM-DIO-XT	PC/104 48-ch. Digital I/O